It sounds to me like the easiest way is to use Rudiger's utility program for removing unused profiles, or use the procedure Lunis identified in his Quick Tips PDF from Certified Sources. That procedure is posted further down in this thread.  It's messy to remove dictation sources manually.

Nonetheless, long ago, I was able to clean up my installation by following this procedure from a Nuance Tech Guy.


1. Close Dragon
2. Press Windows key + E
3. Go to This Pc
4. Go to C:\Program Data\Nuance\NaturallySpeaking15\Users\< Profile name >
5. Delete any folder that beings with tb. The following folders need to be retained:
 
              Backup - (may not exist)
              Backup2 - (may not exist)
        Current
        dataarchive

6. Navigate into the "current" folder.
7. Delete any folder that beings with "t".

(kkkwj: On my system, there were 3 or 4 to delete - ta, ts, tt, ttm)

The following folders must be retained:
          General_
          General__container
          voice (these will be labeled 0_1, 2_1, 3_1, etc.)
          voice_container (these will be labeled 0_1_Container, 0_2_Container, etc.)
 
Try launching Dragon again.
Regards,
Kevin
Nuance Technical Support

You can figure out which 0_1, 2_1 label belongs to which mic by looking in the audio.ini file. I deleted the folders that belonged to the sources I wanted to remove. Here is an example:

[UAP|2 2]

...

DictationSource=USB Microphone

DeviceName=Microphone (2- Samson Meteor Mic)

DeviceType=Microphone (USB)

JackInformation=

So for this one, I would remove the 2_2 and 2_2_Container folders, and the entries in the audio.ini file. The acoustic.ini file also contains some references that could be removed.

But if you can, use the Certified procedure posted further down. It is MUCH easier.

Win10/11/x64, AMD Ryzen 7 3700X/3950X, 64/128GB RAM, Dragon 15.3, SP 7 Standard, SpeechStart, Office 365, KB 2017, Dragon Capture, Samson Meteor USB Desk Mic, Amazon YUWAKAYI headset, Klim and JUKSTG earbuds with microphones, excellent Sareville Wireless Mono Headset, 3 BenQ 2560x1440 monitors, Microsoft Sculpt Keyboard and Logitech G502 awesome gaming mouse.